Hot n Cold

I did some tests with LM35DZ, which is a temperature sensor with analog out put. I connected it to micro controllers ADC (Analog to Digital Converter). The out put of the sensor is 10mV/°C After some calculations, ADC value was converted to centigrade.
Finally it works, i am able to monitor the room temperature from my LCD Display. At beginning i used an my multimeter to differentiate the sensor value and actual room temperature, the meter reading and LCD reading was perfect. After a while i got an idea to detect temperature and give alarm or warning. I modified the code and little bit and tadaaaaa i can verify the temperature variation. Actually i did was if the temperature is greater than 40°c, give an warning, lit an LED or drive a buzzer.
I think this is a cool one for these days. Cause its hot..

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